KR20230135225A - Apparatus and method for generating sound of electrification vehicle - Google Patents

Abstract

The present invention relates to a sound generating device and method for an electric vehicle that generates a tire slip sound when the vehicle turns, including a detection unit that detects status information of the vehicle, a sound output unit that reproduces and outputs a virtual sound, and the detection unit and the It includes a processing unit connected to a sound output unit, wherein the processing unit detects a cornering state of the vehicle based on state information of the vehicle, and determines longitudinal force, lateral force, tire slip ratio, and tire according to the cornering state. Calculate cornering force by analyzing slip angle, calculate contact force based on big data-based tire contact surface and road surface profile, generate tire slip sound based on the cornering force and contact force, and play the tire slip sound. The sound output unit can be controlled to do so.

Description

Sound generating device and method for electric vehicle {APPARATUS AND METHOD FOR GENERATING SOUND OF ELECTRIFICATION VEHICLE}

The present invention relates to a sound generating device and method for an electric vehicle that generates tire slip sound when the vehicle turns.

Electrified vehicles (e.g. electric vehicles, hydrogen electric vehicles, etc.) run on electric motors, so there is no engine sound, making it difficult for pedestrians to recognize the vehicle's approach. To solve this problem, a virtual engine sound system was developed that generates a virtual engine sound and is recognized by pedestrians, and is now mandatory for electric vehicles.

In the virtual engine sound system, engine sounds are realized using an electronic sound generator (ESG). The actuator is mounted on the cowl top panel of the vehicle, and generates additional sound (structural vibration sound) using vehicle body vibration when engine noise is generated. However, joints occur in the welds of the car body cowl bracket on which the actuator is mounted and the cowl top cover, and quality costs for structural reinforcement and vibration insulation are excessive.

KR 102131390 B1 KR 101856935 B1 KR 101744716 B1

The present invention seeks to provide a sound generating device and method for an electric vehicle that generates a tire slip sound when the vehicle ground slips when the vehicle turns.

A sound generating device for an electric vehicle according to embodiments of the present invention includes a detection unit that detects status information of the vehicle, a sound output unit that reproduces and outputs virtual sound, and a processing unit connected to the detection unit and the sound output unit, , the processing unit detects the cornering state of the vehicle based on the state information of the vehicle, calculates the cornering force by analyzing the longitudinal force, lateral force, tire slip ratio, and tire slip angle according to the cornering state, and , Calculating contact force based on big data-based tire contact surface and road surface profile, generating tire slip sound based on the cornering force and the contact force, and controlling the sound output unit to reproduce the tire slip sound. do.

The processing unit is characterized in that it determines whether the vehicle driving state is a cornering state based on the driver's steering angle and tire steering angle input from the detection unit.

The processing unit detects a vibration signal by measuring vehicle body displacement based on the longitudinal force, the lateral force, and the driver's steering angle, and detects a vibration signal based on the tire slip ratio, the tire slip angle, and the tire steering angle. It is characterized by detecting air pressure and temperature deviation.

The processing unit generates an initial sound source of the tire slip sound based on the cornering force, predicts the slip ratio and slip angle of the vehicle based on the tire steering angle, and predicts the predicted slip ratio and slip angle of the vehicle. It is characterized in that the volume of the tire slip sound is adjusted according to.

The processing unit is characterized in that it determines the occurrence point of the tire slip sound based on the longitudinal force and the transverse force.

The processing unit calculates the slip angle due to the lateral force and the shear contact force due to friction on the tire contact surface, and designs the tire slip sound by reflecting the correlation between the shear contact force and the tire slip sound. do.

A method of generating sound for an electric vehicle according to embodiments of the present invention includes the steps of a processing unit detecting a cornering state of the vehicle based on state information of the vehicle detected by a detection unit, and the processing unit detecting a cornering state of the vehicle based on the cornering state of the vehicle. Calculating cornering force by analyzing longitudinal force, lateral force, tire slip ratio, and tire slip angle, the processing unit calculating contact force based on the big data-based tire contact surface and road surface profile, the processing unit calculating the contact force based on the big data-based tire contact surface and road surface profile, Generating a tire slip sound based on cornering force and the contact force, and controlling a sound output unit so that the processing unit reproduces the tire slip sound.

The step of detecting the cornering state of the vehicle may include determining whether the vehicle driving state is in a cornering state based on the driver steering angle and tire steering angle input from the detection unit.

Calculating the cornering force includes detecting a vibration signal by measuring vehicle body displacement based on the longitudinal force, the lateral force, and the driver's steering angle, and the tire slip ratio, the tire slip angle, and the It is characterized in that it includes the step of detecting air pressure and temperature deviation of the tires based on the tire steering angle.

Generating the tire slip sound includes generating an initial sound source of the tire slip sound based on the cornering force, predicting the slip ratio and slip angle of the vehicle based on the tire steering angle, and and adjusting the volume of the tire slip sound according to the predicted slip ratio and slip angle of the vehicle.

The controlling of the sound output unit may include determining a time point of occurrence of the tire slip sound based on the longitudinal force and the transverse force.

The step of generating the tire slip sound includes calculating a slip angle due to the lateral force and a shear contact force due to friction on the tire contact surface, and reflecting the correlation between the shear contact force and the tire slip sound to determine the slip angle of the tire. It is characterized by including the step of designing a slip sound.

The present invention generates a tire slip sound when the vehicle slips on the ground when turning, so it can provide fun and emotional satisfaction to the driver.

1 is a block diagram showing a sound generating device for an electric vehicle according to embodiments of the present invention.
Figure 2 is a diagram for explaining the function of the processing unit of the sound generating device for an electric vehicle according to embodiments of the present invention.
Figure 3 is a diagram for explaining a parameter derivation process for generating tire slip sound according to embodiments of the present invention.
Figure 4 is an analysis diagram showing the correlation between parameters according to embodiments of the present invention.
Figure 5 is a configuration diagram showing a virtual environment sound tuning simulator according to embodiments of the present invention.
Figure 6 is a flowchart showing a method for generating sound in an electric vehicle according to embodiments of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through illustrative drawings. When adding reference numerals to components in each drawing, it should be noted that identical components are given the same reference numerals as much as possible even if they are shown in different drawings. Additionally, when describing embodiments of the present invention, if detailed descriptions of related known configurations or functions are judged to impede understanding of the embodiments of the present invention, the detailed descriptions will be omitted.

In describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, or order of the component is not limited by the term. Additionally, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted in an ideal or excessively formal sense unless explicitly defined in the present application. No.

1 is a block diagram showing a sound generating device for an electric vehicle according to embodiments of the present invention.

An electrified vehicle may be a vehicle that runs using an electric motor, such as an electric vehicle (EV), a plug-in hybrid electric vehicle (PHEV), and/or a hybrid electric vehicle (HEV). . The sound generator 100 of an electric vehicle can design virtual sounds based on the user's auditory experience, and can be personalized by adjusting the tone and accelerator pedal response.

Referring to FIG. 1 , the sound generating device 100 may include a communication unit 110, a detection unit 120, a storage unit 130, a sound output unit 140, and a processing unit 150.

The communication unit 110 may support the sound generating device 100 to communicate with electronic control units (ECUs) mounted on an electric vehicle (hereinafter referred to as vehicle). The communication unit 110 may include a transceiver that transmits and receives CAN messages using the CAN (Controller Area Network) protocol. The communication unit 110 may support the sound generating device 100 to communicate with external electronic devices (eg, terminals and servers, etc.). The communication unit 110 may include a wireless communication circuit and/or a wired communication circuit.

The detection unit 120 may detect driving information and/or environmental information (i.e., vehicle interior environment information and/or vehicle exterior environment information). The detection unit 120 uses sensors and/or ECUs mounted on the vehicle to determine driver steering angle (steering wheel steering angle), tire steering angle (tie rod), vehicle speed, motor RPM (Revolutions Per Minute), Driving information such as motor torque and/or accelerator pedal opening amount can be detected. Sensors may include an Accelerator Pedal Position Sensor (APS), steering angle sensor, microphone, image sensor, distance sensor, wheel speed sensor, Advanced Driver Assistance System (ADAS) sensor, 3-axis accelerometer, and/or Inertial Measurement Unit (IMU). there is. The ECU may include a motor control unit (MCU) and/or a vehicle control unit (VCU).

The storage unit 130 may store sound sources of virtual sounds such as tire slip sounds, warning sounds, driving sounds, acceleration sounds, and/or cornering sounds. The storage unit 130 may store an emotion recognition model, a sound design algorithm, a volume setting algorithm, a volume control logic, and/or a sound equalizer logic. The emotion recognition model can be implemented based on sound-based emotional factors and dynamic characteristic-based emotional factors. Sound-based emotional factors may include acceleration and deceleration for downshifting, slip and pedal response for drifting, and/or tire slip and exhaust sounds for force and response. You can. Dynamic characteristic-based emotion factors may include vibration for sound feedback emotion, body rigidity for ride comfort emotion, and/or chassis balance for maneuverability emotion, etc. Sound-based emotional factors and dynamic characteristic-based emotional factors can be derived in advance by evaluating the correlation between vehicle motion performance and driving emotion. For example, through changes in vehicle speed and motor RPM over time, the correlation between slip during stationary acceleration, jerk when shifting, and sudden acceleration WOT (Wide Open Throttle) emotional factors can be evaluated. Through changes in yaw rate and side slip angle over time, the correlation between dynamic characteristics and emotional factors other than maneuverability during cornering can be analyzed. The sound design algorithm uses the target profile and engine information (e.g. RPM, throttle opening, torque, etc.) to combine the existing Active Sound Design (ASD) function with an engine sound equalizer ( It can include high-performance sound equalizer logic with added Engine Sound Equalizer (ESE) logic.

The storage unit 130 may be a non-transitory storage medium that stores instructions executed by the processing unit 150. The storage unit 130 includes random access memory (RAM), static random access memory (SRAM), read only memory (ROM), programmable read only memory (PROM), electrically erasable and programmable ROM (EEPROM), and erasable and programmable memory (EPROM). ROM), Hard Disk Drive (HDD), Solid State Disk (SSD), embedded multimedia card (eMMC), universal flash storage (UFS), and/or web storage, etc. It may include at least one of the media.

The sound output unit 140 can reproduce virtual sound and output it to speakers mounted in the vehicle. The sound output unit 140 can reproduce and output pre-stored or real-time streaming sound sources. The sound output unit 140 may include an amplifier and a sound reproduction device. The sound reproduction device can reproduce the sound by adjusting its volume, tone (sound quality), and sound image according to instructions from the processing unit 150. The sound reproduction device may include a digital signal processor (DSP) and/or microprocessors. An amplifier can amplify the electrical signal of the sound played by the sound reproduction device.

The processing unit 150 may be electrically connected to each component 110 to 140. The processing unit 150 includes an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), Programmable Logic Devices (PLD), Field Programmable Gate Arrays (FPGAs), a Central Processing unit (CPU), microcontrollers, and/or It may include at least one of processing devices such as microprocessors.

The processing unit 150 may detect (obtain) driver operation information, vehicle interior environment information, and vehicle exterior environment information through the detection unit 120 while the vehicle is driving. Here, driver operation information may include driver steering angle and/or tire steering angle, etc. The vehicle interior environment information may include information such as engine temperature, pedal opening amount, wheel speed-based vehicle speed and/or throttle opening amount, etc., and the vehicle exterior environment information may include outside air temperature and/or GPS-based vehicle speed, etc. there is. The processing unit 150 may design a virtual sound based on driver operation information, vehicle interior environment information, and/or vehicle exterior environment information, and adjust the tone and volume of the virtual sound.

The processing unit 150 can detect the driver's operation using the detection unit 120 while the vehicle is driving. In other words, the processing unit 150 can detect the driver's steering angle and tire steering angle according to the driver's steering wheel operation. The processing unit 150 may determine the vehicle driving state based on the driver's steering angle and/or tire steering angle. Here, the vehicle driving state can be classified into a constant speed state, an acceleration state, and a cornering state.

The processing unit 150 may calculate cornering force by analyzing longitudinal force (longitudinal force), lateral force (lateral force), tire slip ratio, and tire slip angle based on the driver's steering angle and tire steering angle. The processing unit 150 may detect a vibration signal due to load transfer by measuring the front, center, and rear displacement of the vehicle body through vehicle-related parameters, that is, longitudinal force, lateral force, and driver steering angle. The processing unit 150 can provide the deviation of the air pressure and temperature of the front wheels and rear wheels as a numerical value using tire-related parameters, that is, tire slip ratio, tire slip angle, and tire steering angle.

The processing unit 150 may generate an initial sound source by playing at least one sound in the time domain according to changes in parameters related to the vehicle and tires. The processing unit 150 can generate a virtual sound based on cornering force and play it over time. The processing unit 150 may change the timbre of the virtual sound through gain control and design a virtual sound (e.g., tire slip sound) by adjusting the resistance. At this time, the processing unit 150 may design a virtual sound using a tire slip sound generation algorithm.

Additionally, the processing unit 150 can calculate contact force using the tire contact surface and road surface profile based on big data. At this time, the system analysis model based on the tire and road surface (tire and road surface profile conditions) can be used to calculate the slip angle information compared to the lateral force and the shear contact force due to slip on the tire contact surface. In other words, the processing unit 150 can calculate the shear contact force by considering the slip angle caused by the vehicle's lateral force and the friction (friction coefficient) on the tire contact surface. The calculated shear contact force can be used to design tire slip sound that reflects the driving emotions of high-performance car drivers on a racing track.

The processing unit 150 can accumulate analysis results based on big data-based tire contact surface and road surface profile in a database (DB) through tire analysis for ground loading and driving conditions (Tire Rolling Effect). When analyzing tires, tire rotation effects can be implemented based on the theoretical background of Gyroscopic effect and/or Doppler effect. Analysis results may include normal contact force and shear contact force. Here, normal contact force refers to the vertical contact force due to self-weight, and shear contact force refers to the shear direction contact force due to slip. The analysis result DB (big data) can be used to estimate the slip angle caused by lateral force and the shear contact force caused by friction.

The processing unit 150 may design a virtual sound (i.e., tire slip sound) by reflecting the correlation between shear contact force and tire slip sound. The processing unit 150 monitors the status of the vehicle, that is, the slip ratio of the vehicle, in real time and can adjust the volume of the virtual sound by referring to the current slip ratio of the vehicle.

The processing unit 150 may adjust the tone and volume of the virtual sound based on the calculated cornering force. The processing unit 150 may perform pitch control, gain control, APS control, frequency filter, Shepard layer control, and/or volume control on the virtual sound. . Pitch control adjusts the pitch of the sound, and gain control changes the tone and adjusts resistance. APS control adjusts the APS resistance, that is, the degree of response (responsiveness) according to the pressure of the accelerator pedal, and the frequency filter controls the playback frequency band of the sound. Shepherd layer control creates a second sound source and adjusts the control area of that sound source.

The processing unit 150 may control the sound output unit 140 to reproduce virtual sounds by reflecting vehicle environment, driving environment, and/or tire contact surface information using a sound design algorithm. Tire slip sound considers the load transfer mechanism when turning a vehicle and creates an emotional sound design for car body and tire slip based on lateral acceleration. The sound output unit 140 reflects the concept of the tire slip sound, and the sound is finally reproduced through an amplifier to reflect realistic racing track emotion.

Figure 2 is a diagram for explaining the function of the processing unit of the sound generating device for an electric vehicle according to embodiments of the present invention.

The processing unit 150 may determine the vehicle driving state through vehicle state information, such as RPM, torque, and steering angle, obtained by the detection unit 120. Here, the vehicle driving state can be classified into a constant speed state, an acceleration state, and a cornering state.

The processing unit 150 may output virtual sounds, such as acceleration sounds and/or cornering sounds, to the sound output unit 140 through CAN algorithms, sound design, and playback device control.

The processing unit 150 may determine the driving tendency based on information such as cruise control and drive system temperature through the CAN algorithm. The processing unit 150 may determine the road environment based on information such as GPS information and exterior and interior noise differences based on the CAN algorithm. The processing unit 150 may design a virtual sound based on the determined driving tendency and road environment. The processing unit 150 can design acceleration sounds based on pitch, gain, torque, and speed. The processing unit 150 can design cornering sounds based on APS and tire slip.

The processing unit 150 can control the playback device to play the designed virtual sound. The playback device can adjust the sound quality and volume of the played virtual sound according to the instructions of the processing unit 150. The processing unit 150 may control the speaker and exhaust system to output virtual sounds played by the reproduction device.

Figure 3 is a diagram for explaining a parameter derivation process for generating tire slip sound according to embodiments of the present invention.

The sound generating device 100 can reproduce tire slip sound according to tire lateral force. The processing unit 150 of the sound generating device 100 may detect vehicle-related parameters and tire-related parameters using the detection unit 120.

The processing unit 150 of the sound generating device 100 may detect longitudinal force and transverse force through the detection unit 120 (S110). The processing unit 150 may detect the driver's steering angle, that is, the steering angle of the steering wheel, using the detection unit 120 (S120). The processing unit 150 may detect a vibration signal by measuring the displacement of the vehicle body based on vehicle-related parameters such as longitudinal force, lateral force, and driver steering angle (S130).

The processing unit 150 can detect the tire slip ratio and tire slip angle using the detection unit 120 (S140). The processing unit 150 may detect the tire steering angle through the detection unit 120 (S150). The processing unit 150 can provide the deviation in air pressure and temperature of the front and rear wheels (four tires) as a numerical value using tire-related parameters such as tire slip ratio, tire slip angle, and tire steering angle (S160).

Since the tire slip sound, which is a virtual sound, is an event sound, the sound can be played when the longitudinal force and lateral force occur above a predetermined threshold. The processing unit 150 can predict the timing of sound generation based on the steering angle (driver steering angle) according to the driver's steering wheel operation. The processing unit 150 may play a tire slip sound when the actual displacement of the vehicle occurs excessively and the displacement that may cause the vehicle to slip, that is, the longitudinal force and the lateral force, is detected to be greater than a predetermined threshold.

In addition, the processing unit 150 monitors the actual tire steering angle when playing the tire slip sound, predicts the slip ratio and slip angle of the vehicle, and designs the final sound based on the predicted slip ratio and slip angle. Since the slip angles of the four tires are different from the vehicle's turning center, the slip ratio also appears different, and the size of the sound generated in the playback device (e.g., speaker, vibrator, etc.) close to the position of each tire is different from each other, thereby reducing the level of tire slip sound. Emotional quality can be improved.

Figure 4 is an analysis diagram showing the correlation between parameters according to embodiments of the present invention.

In order to maximize emotional quality when generating tire slip sounds, the lateral force generated when steering the vehicle must be referenced, but this cannot be obtained by directly motoring the CAN signal. Accordingly, the sound generating device 100 can generate a diagram by combining factors (parameters) that can estimate the lateral force and design the slip sound with reference to the diagram.

Leading measures that can predict (estimate) lateral force include slip ratio and slip angle. These lines are also used to develop ride and handling (R&H) performance, so they are verified data to a significant degree.

The sound generator 100 can adjust the volume of the tire slip sound source by using the slip ratio and slip angle diagrams of the vehicle. The sound generating device 100 may increase the sound volume as it moves away from the '0' value of each line shown in FIG. 4 and may decrease the sound volume as it gets closer. The difference between the '0' value and the actual vehicle's slip ratio and slip angle appears as a change in the volume of the tire slip sound, and the difference in volume according to the lead interval can be used as a sound design element.

In addition, vehicles using tires with excellent traction used in high-performance cars use a volume diagram similar to the Fx = 4000 [N] diagram, while vehicles with relatively poor traction used in general vehicles use a Fx = 1000 [N] diagram. Using a nearby diagram, you can design the volume of the tire slip sound to match the actual vehicle behavior.

In this way, the sound generating device 100 performs sound design using the slip ratio and slip angle diagrams of the vehicle, thereby minimizing the sense of heterogeneity with the dynamic movement of the vehicle and improving the emotional quality of the virtual sound.

Figure 5 is a configuration diagram showing a virtual environment sound tuning simulator according to embodiments of the present invention.

The virtual environment sound tuning simulator 200 can perform virtual environment sound tuning using ASD HiLS (hardware in loop simulation). The virtual environment sound tuning simulator 200 may include a CAN interface 210, an AMP 220, a sound tuning program 230, and a controller 240.

The CAN interface 210 can record, play, generate, and transmit/receive actual vehicle operation information between each device. In other words, the CAN interface 210 can serve as a CAN signal transmitter that transmits and receives CAN signals collected from the actual vehicle to the AMP 220 and the controller 240. The CAN interface 210 may generate a CAN signal including parameters calculated in the virtual environment sound tuning simulator 200 and transmit it to the AMP 220.

The CAN interface 210 can utilize CAN signals acquired from the vehicle to reproduce the same signals as the vehicle or manipulate the acquired signals, and CANoe 211 and CAN transmit and receive CAN signals between the AMP 220 and the controller 240. Can include Player(212).

AMP 220 may receive tuning parameters of the sound tuning program 230. The AMP 220 can calculate output values according to tuning parameters and CAN signals.

The controller 240 stores and manages the overall operation of the virtual environment sound tuning simulator 200, basic interior sound data generated by recording the NVH (Noise, Vibration, Harshness) sound of the actual vehicle, and manages sound sources (e.g., speakers) within the actual vehicle. It stores and manages sound field characteristic information (Binaural Vehicle Impulse Response, BVIR) from ) to the location of the human ear, and can generate, collect, and process CAN signals that can check the operating status of the vehicle.

The controller 240 may play ASD sound based on the output value (output signal) calculated by the AMP 220. The controller 240 can generate a synthesized sound by synthesizing sound recorded in the actual vehicle (e.g., background noise) and the ASD sound being played in real time. Additionally, the controller 240 may generate the final synthesized sound by reflecting real-vehicle sound space characteristics, that is, BVIR information, in the generated synthesized sound.

The controller 240 may include a sound playback controller. The sound playback controller can output the final synthesized sound. In other words, the sound reproduction controller can perform sound tuning for the final synthesized sound in a virtual environment.

The controller 240 can play the tuned sound to the user using a VR simulator that simulates a virtual driving environment and perform a verification procedure through auditory experience feedback. The controller 240 can provide a real-vehicle level auditory experience by repeatedly verifying the tuned sound and performing sound tuning based on the verification results.

Figure 6 is a flowchart showing a method for generating sound in an electric vehicle according to embodiments of the present invention.

The processing unit 150 of the sound generating device 100 can detect the driver's steering angle and tire steering angle (S200). The processing unit 150 may use the detection unit 120 to detect the driver's steering angle and tire steering angle according to the driver's steering wheel operation while the vehicle is driving. The processing unit 150 may determine whether the vehicle driving state is in a cornering state based on the driver's steering angle and tire steering angle.

The processing unit 150 may calculate cornering force by analyzing longitudinal force, lateral force, tire slip ratio, and tire slip angle based on the driver's steering angle and tire steering angle (S210). The processing unit 150 may detect a vibration signal due to load transfer by measuring the front, center, and rear displacement of the vehicle body through vehicle-related parameters, that is, longitudinal force, lateral force, and driver steering angle. The processing unit 150 can provide the deviation of the air pressure and temperature of the front and rear wheels, that is, the four tires, as numerical values, using tire-related parameters, that is, tire slip ratio, tire slip angle, and tire steering angle.

The processing unit 150 may generate a sound source based on the calculated cornering force and adjust the tone and volume of the generated sound source (S220). The processing unit 150 may generate an initial sound source by playing at least one sound in the time domain according to changes in parameters related to the vehicle and tires. The processing unit 150 can generate a virtual sound based on cornering force and reproduce it in the time domain. The processing unit 150 may change the timbre of the virtual sound through gain control and design a virtual sound (e.g., tire slip sound) by adjusting the resistance. At this time, the processing unit 150 may design a virtual sound using a tire slip sound generation algorithm.

The processing unit 150 can calculate the contact force using the big data-based tire contact surface and road surface profile (S230). At this time, the system analysis model based on the tire and road surface (tire and road surface profile conditions) can be used to calculate the slip angle information compared to the lateral force and the shear contact force due to slip on the tire contact surface. The calculated shear contact force can be used to design tire slip sound that reflects the driving emotions of high-performance car drivers on a racing track.

The processing unit 150 may design the tire slip sound by reflecting the correlation between the shear contact force and the tire slip sound based on the calculated contact force (S240).

The processing unit 150 can reproduce and output a virtual sound, that is, a tire slip sound, designed using the sound output unit 140 (S250). The processing unit 150 may determine the timing of generation (i.e., reproduction timing) of the tire slip sound based on the driver's steering angle and tire steering angle. For example, the processing unit 150 may instruct the sound output unit to play a tire slip sound when the driver's steering angle and tire steering angle are greater than or equal to a predetermined threshold. The processing unit 150 monitors the status of the vehicle, that is, the slip ratio of the vehicle, in real time and can adjust the volume of the virtual sound by referring to the current slip ratio of the vehicle. The processing unit 150 monitors the tire steering angle to predict the vehicle's slip ratio and slip angle, and finally designs a sound that matches the predicted vehicle's slip ratio and slip angle by referring to the vehicle's slip ratio and slip angle diagram. can do.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but rather to explain it, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

Claims (12)

A detection unit that detects status information of the vehicle;
A sound output unit that plays and outputs virtual sound; and
It includes a processing unit connected to the detection unit and the sound output unit,
The processing unit,
Detect the cornering state of the vehicle based on the state information of the vehicle,
Calculate the cornering force by analyzing the longitudinal force, lateral force, tire slip ratio, and tire slip angle according to the cornering state,
Calculate contact force based on big data-based tire contact surface and road surface profile,
Generate tire slip sound based on the cornering force and the contact force,
A sound generating device for an electric vehicle, characterized in that controlling the sound output unit to reproduce the tire slip sound.
In claim 1,
The processing unit,
A sound generating device for an electric vehicle, characterized in that it determines whether the vehicle driving state is in a cornering state based on the driver's steering angle and tire steering angle input from the detection unit.
In claim 2,
The processing unit,
Detecting a vibration signal by measuring vehicle body displacement based on the longitudinal force, the transverse force, and the driver's steering angle,
A sound generating device for an electric vehicle, characterized in that detecting air pressure and temperature deviation of tires based on the tire slip ratio, the tire slip angle, and the tire steering angle.
In claim 3,
The processing unit,
Generating an initial sound source of the tire slip sound based on the cornering force,
Sound generation of an electric vehicle, characterized in that predicting the slip ratio and slip angle of the vehicle based on the tire steering angle, and adjusting the volume of the tire slip sound according to the predicted slip ratio and slip angle of the vehicle. Device.
In claim 1,
The processing unit,
A sound generating device for an electric vehicle, characterized in that determining the timing of generation of the tire slip sound based on the longitudinal force and the transverse force.
In claim 1,
The processing unit,
Calculate the slip angle due to the lateral force and the shear contact force due to friction on the tire contact surface,
A sound generating device for an electric vehicle, characterized in that the tire slip sound is designed by reflecting the correlation between the shear contact force and the tire slip sound.
A processing unit detecting a cornering state of the vehicle based on vehicle status information detected by a detection unit;
Calculating cornering force by the processing unit analyzing longitudinal force, lateral force, tire slip ratio, and tire slip angle according to the cornering state of the vehicle;
The processing unit calculating contact force based on big data-based tire contact surface and road surface profile;
generating a tire slip sound by the processing unit based on the cornering force and the contact force; and
A sound generating method for an electric vehicle, characterized in that the processing unit controls a sound output unit to reproduce the tire slip sound.
In claim 7,
The step of detecting the cornering state of the vehicle is:
A method of generating sound for an electric vehicle, comprising the step of determining whether the vehicle driving state is a cornering state based on the driver steering angle and tire steering angle input from the detector.
In claim 8,
The step of calculating the cornering force is,
detecting a vibration signal by measuring vehicle body displacement based on the longitudinal force, the transverse force, and the driver's steering angle; and
A method of generating sound for an electric vehicle, comprising the step of detecting air pressure and temperature deviation of tires based on the tire slip ratio, the tire slip angle, and the tire steering angle.
In claim 9,
The step of generating the tire slip sound is,
generating an initial sound source of the tire slip sound based on the cornering force;
predicting the slip ratio and slip angle of the vehicle based on the tire steering angle; and
A method of generating sound for an electric vehicle, comprising the step of adjusting the volume of the tire slip sound according to the predicted slip ratio and slip angle of the vehicle.
In claim 7,
The step of controlling the sound output unit is,
A sound generating method for an electric vehicle, comprising the step of determining a time point of occurrence of the tire slip sound based on the longitudinal force and the transverse force.
In claim 7,
The step of generating the tire slip sound is,
calculating a slip angle due to the lateral force and a shear contact force due to friction on the tire contact surface; and
A method of generating sound for an electric vehicle, comprising the step of designing the tire slip sound by reflecting the correlation between the shear contact force and the tire slip sound.

Images